It's good to have a plant that finds the perfect spot and thrives there. Nothing to do with the gardener knowing where best to plant it. I had its parent planted in the rockery nearby two years ago. Last summer I was thrilled to see that it had seeded itself in small cracks between the patio slabs. It flowered very freely from its new home, and I liked it very much. This year, there are many more seedling plants among many more cracks, and they are be growing very happily.